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Income taxes - Net Deferred Tax Assets and Liabilities (Details) - CHF (SFr)
SFr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Abstract]      
Net amount at January 1 SFr 97.1 SFr 59.1 SFr 13.9
thereof deferred tax assets 107.8 69.5 31.7
thereof deferred tax liabilities (10.8) (10.5) (17.9)
Taxes charged      
to income statement 36.6 46.2 SFr 18.6
to other comprehensive income 0.1 0.7  
Exchange differences 1.3 (1.6)  
Net amount at December 31 SFr 59.1 SFr 13.9